I read dozens of books a year, so pulling one out is tough but I will go with "Wise Beyond Your Field" by Nancy Napier. While on the faculty at Boise State University, Nancy brought together a networking group consisting of the football coach, the sheriff, the director of a dance company, the founder of a software company, and others. As one of them stated, "If what you are pursuing is the best practices of your industry, you will never rise to the top." What can you learn from others outside your field? As an example, the software company followed the football coach's example of position coaches, providing coaches to the different roles people held in his company.